A study on the Purina site:
http://www.purina.com/institute/news.asp?article=421
and an article in DVM Magazine:
http://www.dvmnewsmagazine.com/dvm/article/articleDetail.jsp?id=26745
and more on body fat and health problems:
http://www.dvmnewsmagazine.com/dvm/article/articleDetail.jsp?id=81753
Here's a pdf of the body condition scale:
http://www.purina.com/images/articles/pdf/AdultBodyCondChart.pdf
Here's a pdf of the body condition scale for puppies:
http://www.purina.com/images/articles/pdf/PuppyBodyCondChart.pdf
http://www.purina.com/institute/news.asp?article=421
and an article in DVM Magazine:
http://www.dvmnewsmagazine.com/dvm/article/articleDetail.jsp?id=26745
and more on body fat and health problems:
http://www.dvmnewsmagazine.com/dvm/article/articleDetail.jsp?id=81753
Here's a pdf of the body condition scale:
http://www.purina.com/images/articles/pdf/AdultBodyCondChart.pdf
Here's a pdf of the body condition scale for puppies:
http://www.purina.com/images/articles/pdf/PuppyBodyCondChart.pdf